Understanding the Technical Issues in Japanese Factuality Analysis Through Error Analysis

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  • 誤り分析に基づく日本語事実性解析の課題抽出
  • アヤマリ ブンセキ ニ モトズク ニホンゴ ジジツセイ カイセキ ノ カダイ チュウシュツ

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Abstract

Event factuality is information pertaining to whether events mentioned in the natural language correspond to either actual events that have occurred in the real world or events that are of uncertain interpretation. In factuality analysis, sufficient performance is yet to be achieved because of the complexity of issues such as functional expression and linguistic scope. This paper discusses the issues involved in factuality analysis by analyzing errors when applying a rule-based system to 3,734 events in 1,533 sentences. We annotate functional expression labels for all events. In the main events, the factuality analyzer, consisting of simple functional expression rules, achieves approximately 90% accuracy if correct functional expression labels are provided. In subordinate events, we found many errors specific to subordinate events, such as errors caused by predicates and linguistic scopes. We provide guidelines for factuality analysis through additional discussion regarding predicates and linguistic scope.

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